Trendy New Workouts: Strollercize, Aqua Zuma, Krav Maga

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There are always new trends on the exercise front, and this week, Reader's Digest takes its own look at five new workout trends.

Here are some higlights:

Stroller Workouts -- Pushing 35 pounds-plus while walking or running can help you burn 372 to 444 calories, according to RD. It even rivals bike riding and mowing the lawn. There are even stroller workout chain classes, including in New York City.

Krav Maga -- It's the official self-defense system of the Israeli Defense Forces, and the hand-to-hand combat is supposed to offer an intense workout. There are plenty of studios opening up around New York City, and judging from these sneak peeks, this is not for the faint of heart.

Forza: The Samurai Sword Workout -- The New York Times' Gym Class reporter tried this out last month, and it turns out the class requires intense focus and concentration in order to get the most out of its promise to tone and strengthen. The Equinox club on the Upper West Side currently has this class.

Unnata Aerial Yoga -- This particular class is based in Minneapolis, but its hammock-based yoga workout is basically the premise of Anti-Gravity Yoga, offered here in New York City. Suspended from the ceiling in a hammock, students practice yoga blended with elements of aerial acrobatics, dance, pilates and calisthenics.

Aqua Zumba -- There are only a few centers offering this Zumba pool workout, including the Norwell, Mass.-based Webb's Pro Fitness. The instructor there, Amy Webb, tells RD that the cardiovascular workout of the Latin dance-based Zumba combined with the resistance training of the water make it a hit with the young and old alike.

What new fitness class has popped up on your radar? We want to hear about it! Let us know in the comments section below.